no crank no start. ANY ADVICE !? - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 04-13-2012, 09:34 PM   eBay Motors  #1 (permalink)
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Exclamation no crank no start. ANY ADVICE !?

Been having electrical problems since last July, i changed the bcm today, had it programmed with the tech 2, then tried to re learn the theft deterrant system and it wont with a tech2, tried manual relearn, it locks the truck up after the first cycle out of three. Swapping out ecm tomorrow to see if i can even get the truck to crank.

v2 or tech 2 wil communicate now.

Any body help or have any suggestions??

I know the duramax community is usually pretty tight, but its like when i ask for help on this topic i might as well have chugged a fifth of jack at an AA meeting.

hopefully somebody can help.
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Old 04-13-2012, 09:50 PM   eBay Motors  #2 (permalink)
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Originally Posted by battlegraduate09 View Post
Been having electrical problems since last July, i changed the bcm today, had it programmed with the tech 2, then tried to re learn the theft deterrant system and it wont with a tech2, tried manual relearn, it locks the truck up after the first cycle out of three. Swapping out ecm tomorrow to see if i can even get the truck to crank.

v2 or tech 2 wil communicate now.

Any body help or have any suggestions??

I know the duramax community is usually pretty tight, but its like when i ask for help on this topic i might as well have chugged a fifth of jack at an AA meeting.

hopefully somebody can help.
I don't know if this would even cause this much problems, but have you checked the wire loom that is zip tied to the altenator bracket. I know if it rubbs through and those wires break or ground out, it can cause some strange problems.
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Old 04-13-2012, 09:52 PM   eBay Motors  #3 (permalink)
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iv had electrical issues since last July, i have been through wires and grounds 100s of times.
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Old 04-14-2012, 05:57 AM   eBay Motors  #4 (permalink)
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Old 04-14-2012, 06:21 AM   eBay Motors  #5 (permalink)
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Is it actually in Theft lock mode? Any codes present?
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Old 04-14-2012, 08:37 AM   eBay Motors  #6 (permalink)
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Sometimes they get a short under the hood fuse box. The wires rub against the support brackets.

Of course the NSBU switch can always be a problem with the LLY. But without communication-- that cannot be the issue.

Some do have ignition switch problems-- but easy to check with a test light or volt meter.

Good luck
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Old 04-14-2012, 08:43 AM   eBay Motors  #7 (permalink)
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Is it actually in Theft lock mode? Any codes present?
Can't read codes, won't communicate. Swapping ECMs now to see if it cranks at all


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Old 04-14-2012, 11:07 AM   eBay Motors  #8 (permalink)
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Old 04-14-2012, 01:03 PM   eBay Motors  #9 (permalink)
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Got it cranking.

Big thanks to George Alexander and bob Olson !!!


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Old 04-14-2012, 01:32 PM   eBay Motors  #10 (permalink)
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What was wrong?
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